Responsive Web Design

Working on the web, however, is a wholly different matter. Our work is defined by its transience, often refined or replaced within a year or two. Inconsistent window widths, screen resolutions, user preferences, and our users’ installed fonts are but a few of the intangibles we negotiate when we publish our work, and over the years, we’ve become incredibly adept at doing so.

via A List Apart: Articles: Responsive Web Design.